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Class Aves (Phylum Chordata of kingdom Animalia)
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- เผยแพร่เมื่อ 14 มี.ค. 2023
- The Aves belong to the phylum Chordata of the animal kingdom. It has about 9,000 species. Aves are adapted to fly. All the birds come in the class Aves.
Characteristics of Aves
Birds are warm-blooded animals.
Their forelimbs are modified into wings.
They have well-developed flight muscles that help during the flight.
Their hind limbs are adapted for walking, hopping, perching, grasping, wading and swimming.
There are epidermal scales on their legs.
The endoskeleton is bony with long hollow bones filled with air cavities. known as pneumatic bones.
Their spindle-shaped body minimizes resistance of the wind.
The feathers help in preventing heat loss and reduce air friction by providing passage to the air.
There is no skin gland except the oil gland.
The lower and upper and jaws are modified into a beak.
They have no teeth.
They have sharp eyesight.
The alimentary canal has a crop and a gizzard. The crops help in softening food, and the gizzard helps in crushing the food.
Pigeons and other seed-eating birds lack a gall bladder.
They have spongy and elastic lungs for respiration.
The special vocal organ called syrinx is present at the base of trachea.
Their heart is four-chambered.
RBCs are oval, nucleated and biconvex.
12 pairs of cranial nerves are present.
They have a single ovary and oviduct on the left side
All the birds are oviparous and exhibit sexual dimorphism. The eggs have four embryonic membranes- amnion, chorion, allantois, and yolk sac.
#birdsCharacteristics
Sir kal pepar hai aaj pta chla ki aap etna acha padhate ho maine sare videos dekh dale kas pepar bhi acha ho jaye
Walikum assalam sir😊.best teacher in the world 🌎😊
Allah Pak AP Ko Salamt rkhy 💞 SIR
Sir bohat zabardast sir
Your teaching is osm ❤❤❤
Good explanation sir .. from India
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Thank you Sir.🙏🙏🙏
وعلیکم السلام استاد جی
Boht mehnat hai
Very nice lecture
Sir plz must upload the lectures of "form and function in plants "
❤❤❤❤❤❤❤❤🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤🎉🎉🎉🎉❤❤❤❤ nice lecturer in around our Pakistan
Exceptional Sir..
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Sir Pakistan ke hain hain kya
Sir g ye kya .
Apka weight to kafi barh chuka hai . Sir g apko heart attack bhi hoskata hai .
Pir hamara kya Hoga 😂
👍🏻
More diag can be included
Class Mammalia kab upload karain gaye??
Sir g chapter 7 please
What language is that ?
Urdu
Lion entry on you tube
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